Method for extruding a continuous molded body
AssigneeZimmer, Inc.
InventorsStefan Zikeli, Friedrich Ecker
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Abstract
The present invention relates to a method for producing a continuously molded body from an extrusion solution preferably containing water, cellulose and a tertiary amine. The extrusion solution is extruded through an extrusion duct orifice to obtain a continuously molded body. The continuously molded body is passed through an air gap in which it is stretched. To increase the loop strength and to reduce the tendency to fibrillate, the mean acceleration and/or the mean heat flow density are controlled according to the invention in accordance with predetermined formulae.
Claims27
A method for extruding a continuously molded body from an extrusion solution, comprising:
- passing the extrusion solution through an extrusion duct of a predetermined length and a predetermined diameter to an extrusion duct orifice;
- extruding the extrusion solution through the extrusion duct orifice to obtain an extruded, continuously molded body;
- passing the continuously molded body through an air gap of a predetermined air gap height;
- accelerating the continuously molded body in the air gap;
- wherein:
- the heat flow density Q substantially averaged over the air gap height is controlled to obtain a value
- Q
- =
- 0.004
- α
- ·
- [
- 1
- β
- ]
- 0.3
- wherein β is the ratio of length to diameter of the extrusion duct and the value of the control parameter α is at least 0.1.
Dependencies are inferred from the claim text.